File indexing completed on 2024-04-21 04:51:40

 /*
     SPDX-FileCopyrightText: 2008 Jean-Baptiste Mardelle <jb@kdenlive.org>
     Based on code by Arendt David <admin@prnet.org>
 
 SPDX-License-Identifier: GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
 */
 
 #include "jogshuttle.h"
 
 #include "kdenlive_debug.h"
 
 #include <QApplication>
 #include <QDir>
 #include <cerrno>
 #include <cstring>
 #include <sys/select.h>
 #include <utility>
 // according to earlier standards
 #include <sys/time.h>
 #include <sys/types.h>
 #include <unistd.h>
 
 // init media event type constants
 const QEvent::Type MediaCtrlEvent::Key = QEvent::Type(QEvent::registerEventType());
 const QEvent::Type MediaCtrlEvent::Jog = QEvent::Type(QEvent::registerEventType());
 const QEvent::Type MediaCtrlEvent::Shuttle = QEvent::Type(QEvent::registerEventType());
 
 ShuttleThread::ShuttleThread(QString device, QObject *parent)
     : m_device(std::move(device))
     , m_parent(parent)
     , m_isRunning(false)
 {
 }
 
 ShuttleThread::~ShuttleThread() = default;
 
 QString ShuttleThread::device()
 {
     return m_device;
 }
 
 void ShuttleThread::stop()
 {
     m_isRunning = false;
 }
 
 void ShuttleThread::run()
 {
     media_ctrl mc;
     media_ctrl_open_dev(&mc, m_device.toUtf8().data());
     if (mc.fd < 0) {
         return;
     }
     fd_set readset;
     struct timeval timeout;
     // enter thread loop
     m_isRunning = true;
     while (m_isRunning) {
         // reset the read set
         FD_ZERO(&readset);
         FD_SET(mc.fd, &readset);
         // reinit the timeout structure
         timeout.tv_sec = 0;
         timeout.tv_usec = 400000;
         // do select in blocked mode and wake up after timeout
         // for stop_me evaluation
         int result = select(mc.fd + 1, &readset, nullptr, nullptr, &timeout);
         // see if there was an error or timeout else process event
         if (result < 0 && errno == EINTR) {
             // EINTR event caught. This is not a problem - continue processing
             continue;
         }
         if (result < 0) {
             // stop thread
             m_isRunning = false;
         } else if (result > 0) {
             // we have input
             if (FD_ISSET(mc.fd, &readset)) {
                 media_ctrl_event mev;
                 mev.type = MEDIA_CTRL_EVENT_NONE;
                 // read input
                 media_ctrl_read_event(&mc, &mev);
                 // process event
                 handleEvent(mev);
             }
         } else if (result == 0) {
             // on timeout
         }
     }
     // close the handle and return thread
     media_ctrl_close(&mc);
 }
 
 void ShuttleThread::handleEvent(const media_ctrl_event &ev)
 {
     if (ev.type == MEDIA_CTRL_EVENT_KEY) {
         key(ev);
     } else if (ev.type == MEDIA_CTRL_EVENT_JOG) {
         jog(ev);
     } else if (ev.type == MEDIA_CTRL_EVENT_SHUTTLE) {
         shuttle(ev);
     }
 }
 
 void ShuttleThread::key(const media_ctrl_event &ev)
 {
     if (ev.value == KEY_PRESS) {
         QApplication::postEvent(m_parent, new MediaCtrlEvent(MediaCtrlEvent::Key, ev.index + 1));
     }
 }
 
 void ShuttleThread::shuttle(const media_ctrl_event &ev)
 {
     int value = ev.value / 2;
 
     if (value > MaxShuttleRange || value < -MaxShuttleRange) {
         // qCDebug(KDENLIVE_LOG) << "Jog shuttle value is out of range: " << MaxShuttleRange;
         return;
     }
     QApplication::postEvent(m_parent, new MediaCtrlEvent(MediaCtrlEvent::Shuttle, value));
 }
 
 void ShuttleThread::jog(const media_ctrl_event &ev)
 {
     QApplication::postEvent(m_parent, new MediaCtrlEvent(MediaCtrlEvent::Jog, ev.value));
 }
 
 JogShuttle::JogShuttle(const QString &device, QObject *parent)
     : QObject(parent)
     , m_shuttleProcess(device, this)
 {
     m_shuttleProcess.start();
 }
 
 JogShuttle::~JogShuttle()
 {
     stopDevice();
 }
 
 void JogShuttle::stopDevice()
 {
     if (m_shuttleProcess.isRunning()) {
         // tell thread to stop
         m_shuttleProcess.stop();
         m_shuttleProcess.quit();
         // give the thread some time (ms) to shutdown
         m_shuttleProcess.wait(600);
 
         // if still running - do it in the hardcore way
         if (m_shuttleProcess.isRunning()) {
             m_shuttleProcess.terminate();
             qCWarning(KDENLIVE_LOG) << "Needed to force jogshuttle process termination";
         }
     }
 }
 
 void JogShuttle::customEvent(QEvent *e)
 {
     QEvent::Type type = e->type();
 
     if (type == MediaCtrlEvent::Key) {
         auto *mev = static_cast<MediaCtrlEvent *>(e);
         Q_EMIT button(mev->value());
     } else if (type == MediaCtrlEvent::Jog) {
         auto *mev = static_cast<MediaCtrlEvent *>(e);
         int value = mev->value();
 
         if (value < 0) {
             Q_EMIT jogBack();
         } else if (value > 0) {
             Q_EMIT jogForward();
         }
     } else if (type == MediaCtrlEvent::Shuttle) {
         auto *mev = static_cast<MediaCtrlEvent *>(e);
         Q_EMIT shuttlePos(mev->value());
     }
 }
 
 QString JogShuttle::canonicalDevice(const QString &device)
 {
     return QDir(device).canonicalPath();
 }
 
 DeviceMap JogShuttle::enumerateDevices(const QString &devPath)
 {
     DeviceMap devs;
     QDir devDir(devPath);
 
     if (!devDir.exists()) {
         return devs;
     }
 
     const QStringList fileList = devDir.entryList(QDir::System | QDir::Files);
     for (const QString &fileName : fileList) {
         QString devFullPath = devDir.absoluteFilePath(fileName);
         QString fileLink = JogShuttle::canonicalDevice(devFullPath);
         // qCDebug(KDENLIVE_LOG) << QString(" [%1] ").arg(fileName);
         // qCDebug(KDENLIVE_LOG) << QString(" [%1] ").arg(fileLink);
 
         media_ctrl mc;
         media_ctrl_open_dev(&mc, fileLink.toUtf8().data());
         if (mc.fd > 0 && (mc.device != nullptr)) {
             devs.insert(QString(mc.device->name), devFullPath);
             qCDebug(KDENLIVE_LOG) << QStringLiteral(" [keys-count=%1] ").arg(media_ctrl_get_keys_count(&mc));
         }
         media_ctrl_close(&mc);
     }
 
     return devs;
 }
 
 int JogShuttle::keysCount(const QString &devPath)
 {
     media_ctrl mc;
     int keysCount = 0;
 
     QString fileLink = canonicalDevice(devPath);
     media_ctrl_open_dev(&mc, fileLink.toUtf8().data());
     if (mc.fd > 0 && (mc.device != nullptr)) {
         keysCount = media_ctrl_get_keys_count(&mc);
     }
 
     return keysCount;
 }